Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a8cfff5af41e2b…

MALICIOUS

PDF

76.5 KB Created: 2021-05-15 22:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bf66ab7fb47f95414785b938f1b8e5 SHA-1: 7b86e5abb8a05047e8f0095429680adb32951794 SHA-256: a8a8cfff5af41e2b6e8d533ae7eecc33ab6b5c3dce1d1cac580d3fcd4730b0ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded URLs likely lead to further stages of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wb?keyword=best%20tech%20tools%20for%20writers
    • http://bopugafuwu.scienceontheweb.net/70984895996.pdf
    • http://medyayazilimtr.com/how_to_do_crossfit_workouts_at_homegvsbs.pdf
    • http://slamelina.website/895867513291c76o.pdf
    • http://nokapasopi.iblogger.org/pathway_fetal_distress.pdf
    • http://electorat.org/dd_one_shots_for_3_players668a6.pdf
    • http://gmetry.online/bhakti_gana_dj_mer9uwa.pdf
    • http://trikotoria.ru/cch_chnh_ng_h_xe_attila_venusc7h7r.pdf
    • http://1cats.space/dd_epic_level_handbook_5epovd9.pdf
    • http://alkostore.xyz/85782749079mair6.pdf
    • http://good-production11.site/lojaxabogepobesewagema71gx9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_6cee01f810894d4a9378717aac9f61b4.pdf?index=true
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_1210d8803a094cdd9e0b7147ef5c3071.pdf?index=true
    • http://mogixos.atwebpages.com/piping_isometric_drawing_basics.pdf
    • http://kivekogifix.epizy.com/kuwuzexumuzusuraruziv.pdf
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_ec06b6df951940dc8b5d15a704b29370.pdf?index=true
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_37fa8c9505a24324a4a8ed24cb555687.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_0b6231637d22436cb3466fe90a53fa32.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_ab8bb0d93b1e4094b82352db18dc60cf.pdf?index=true
    • http://solazagu.epizy.com/nuxerureluxelinajepe.pdf
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_7d2a6c2a8c0644f184fd22bc4fe9ea3b.pdf?index=true
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_690ce212f4f84cbcb93c7a6a062a8b7f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee29.bin
78a3af22185944fd7f5ec090af59706343cd245a48165e9226484338742957e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 4900 bytes
font_01_sfnt_off0000feea.bin
7565b6f3050408a4e20cf0c9cfb2b685869c96c78120128016bf6f5c853573b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 11500 bytes

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